private void btnUpdateClient_Click(object sender, RoutedEventArgs e)
 {//For insertion Done
     string name        = txbNewService_name.Text;
     string address     = txbNewService_address.Text;
     string telephone   = txbNewService_telephone.Text;
     string emailadress = txbNewService_email.Text;
     string fax         = txbNewService_fax.Text;
     string cellphone   = txbNewService_cellphone.Text;
     string service     = cbbNewService_entities.SelectionBoxItem.ToString();
     string agency_ID   = GeneralMethods.makeAgency_ID(name, service);
 }
        private void BtnNewService_add_Click(object sender, RoutedEventArgs e)
        {
            //For insertion Done
            string name        = txbNewService_name.Text;
            string address     = txbNewService_address.Text;
            string telephone   = txbNewService_telephone.Text;
            string emailadress = txbNewService_email.Text;
            string fax         = txbNewService_fax.Text;
            string cellphone   = txbNewService_cellphone.Text;
            string service     = cbbNewService_entities.SelectionBoxItem.ToString();
            string postalcode  = txbNewService_areaCode.Text;
            string agency_ID   = GeneralMethods.makeAgency_ID(name, postalcode);

            //Query for inserting the service provider
            try
            {
                NpgsqlConnection myConnect = new NpgsqlConnection(MainWindow.ConnectionString);
                myConnect.Open();
                using (var cmd = new NpgsqlCommand($"INSERT INTO agencydetails (agency_id,nameofagency,address,telephone,emailaddress,fax,cellphone,service) VALUES (@agency_id,@nameofagency,@address,@telephone,@emailaddress,@fax,@cellphone,@service)", myConnect))
                {
                    cmd.Parameters.AddWithValue("agency_id", agency_ID);
                    cmd.Parameters.AddWithValue("nameofagency", name);
                    cmd.Parameters.AddWithValue("address", address);
                    cmd.Parameters.AddWithValue("telephone", telephone);
                    cmd.Parameters.AddWithValue("emailaddress", emailadress);
                    cmd.Parameters.AddWithValue("fax", fax);
                    cmd.Parameters.AddWithValue("cellphone", cellphone);
                    cmd.Parameters.AddWithValue("service", service);
                    cmd.ExecuteNonQuery();
                }
                MessageBox.Show($"Successfully added into database. Agency_Id is: {agency_ID}");
            }
            catch (Exception h)
            {
                MessageBox.Show(h.ToString());
            }
        }